ios - 没有使用 Objective-C 选择器 ('nextPage' 声明的方法)

Question

自从我更新到 7.3.1 后，xcode 创建了一些警告:“没有使用 Objective-C 选择器 ('nextPage') 声明的方法”。我不确定我现在需要做什么。这些是产生警告的两行:

let leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
let rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))

这是完整的 VC 代码:

import Foundation
import UIKit
class VC1 : UIViewController {

class MyCustomNavigationController: UINavigationController {

    override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {

        return (visibleViewController?.supportedInterfaceOrientations())!

    }


    override func shouldAutorotate() -> Bool {

        return (visibleViewController?.shouldAutorotate())!

    }

}

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {

    return UIInterfaceOrientationMask.Portrait

}

override func shouldAutorotate() -> Bool {

    return true

}

override func viewDidLoad() {

    super.viewDidLoad()

    func nextPage(sender:UISwipeGestureRecognizer) {

        switch sender.direction {



        case UISwipeGestureRecognizerDirection.Left:

            print("SWIPED LEFT", terminator: "")

            self.performSegueWithIdentifier("seg1", sender: nil)

        default:

            break

        }


    let leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))

    let rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))


    leftSwipe.direction = .Left

    rightSwipe.direction = .Right



    view.addGestureRecognizer(leftSwipe)

    view.addGestureRecognizer(rightSwipe)

}

    }

}

我在研究的时候发现了这个:

Selector("funcName") 更改为#selector(ClassName.funcName)

我想“funcName”应该是 nextPage，但我必须将什么设置为 ClassName？

不幸的是，xcode 没有提供任何解决此问题的建议。希望你能帮忙。谢谢。

Answer 1

您需要将 nextPage 放入 viewDidLoad() 中，然后 #selector(VC1.nextPage)

func nextPage(sender:UISwipeGestureRecognizer) {

    switch sender.direction {
        case UISwipeGestureRecognizerDirection.Left:

        print("SWIPED LEFT", terminator: "")

        self.performSegueWithIdentifier("seg1", sender: nil)

       default:

        break

    }
}

override func viewDidLoad() {

   super.viewDidLoad()

   let leftSwipe = UISwipeGestureRecognizer (target: self, action:  #selector(VC1.nextPage))

   let rightSwipe = UISwipeGestureRecognizer (target: self, action:  #selector(VC1.nextPage))
}